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Biology of Reproduction, Vol 22, 744-750, Copyright © 1980 by Society for the Study of Reproduction

Concentrations of Circulating Gonadotropins During Various Reproductive States in Mares

KURT F. MILLER 1, S. L. BERG 1, D. C. SHARP 1, , and O. J. GINTHER 1

1 Department of Veterinary Science, University of Wisconsin, Madison, Wisconsin 53706


Concentrations of circulating FSH and LH were measured in pony and horse mares during the estrous cycle. The gonadotropin profiles did not differ significantly between the two types of mares. During the estrous cycle FSH and LH were secreted in a reciprocal pattern with FSH high during diestrus and LH high during estrus. Although the patterns of FSH and progesterone secretion were similar, FSH rose before progesterone at the end of estrus, indicating that the initial FSH increase was not due to a positive feedback effect of progesterone. The patterns of LH, but not of FSH secretion, diverged between nonpregnant and pregnant mares 19 days after ovulation. In both hysterectomized and pregnant mares, FSH concentrations were elevated after the end of estrus, comparable to what occurred during diestrus. Treatment of diestrous mares with estradiol or of seasonally anovulatory mares with clomiphene citrate had no significant effect on concentrations of circulating FSH or LH.

Note:
ACKNOWLEDGMENTS This work was supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison. Antiserum to human FSH, used in the equine FSH assay, was donated by NIAMDD. Clomiphene citrate was a gift of Merrell-National Laboratories, Cincinnati, OH. The authors acknowledge the technical assistance of Dr. L. C. Nuti, Dr. E. L. Squires and Mr. L. J. Freedman. The authors appreciate the assistance of Mr. A. Hardie with the statistical analyses and Mr. T. E. Ladell with the preparation of figures.

Submitted on July 17, 1979
Accepted on February 1, 1980




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Copyright © 1980 by the Society for the Study of Reproduction.